Eight years after losing her husband, Fuyuko (Takako Izumi) lives peacefully with her daughter and son-in-law. Her greatest wish is to become a young grandmother and enjoy life surrounded by grandchildren. However, her daughter Midori (Anri Mizuna) struggles with the unfulfilled desire to have a child, burdened by the pressure of motherhood and unable to meet her own expectations. As her emotional pain reaches its limit, Midori develops a disturbing idea—allowing her mother to bear a child in her place. Soon, this forbidden desire becomes directed toward her husband, Akio.